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Merge request
<a href="https://gitlab.com/gnutls/gnutls/merge_requests/917">!917</a>
was reviewed by
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286315">lib/auth/psk.h</a>:
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<td class="diff-line-num new new_line" data-linenumber="72" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="nf" style="color: #900; font-weight: 600;">_gnutls_copy_psk_username</span><span class="p">(</span><span class="n" style="color: #333;">psk_auth_info_t</span> <span class="n" style="color: #333;">info</span><span class="p">,</span> <span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">username</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="c"><span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="c"> <span class="n" style="color: #333;">assert</span><span class="p">(</span><span class="k" style="font-weight: 600;">sizeof</span><span class="p">(</span><span class="n" style="color: #333;">info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">username</span><span class="p">)</span> <span class="o" style="font-weight: 600;">>=</span> <span class="n" style="color: #333;">username</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span><span class="p">);</span></span>
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<p dir="auto">I think there is an off by one here. If the equality holds, there is no space for the null.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286316">lib/auth/psk_passwd.c</a>:
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">username_matches</span><span class="p">(</span><span class="k" style="font-weight: 600;">const</span> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">username</span><span class="p">,</span></span>
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<p dir="auto">This function doesn't have a consistent return value. At some point it returns a negative error code, later it returns the output of memcmp. It may be simpler to make it unsigned or bool and have a binary output.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286317">lib/handshake-checks.c</a>:
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">cred_type</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_CRD_PSK</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">cred_type</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_CRD_SRP</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">username</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint16_t</span> <span class="n" style="color: #333;">username_length</span><span class="p">;</span></span>
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<p dir="auto">Why use uint16_t here instead of int or unsigned?</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286318">lib/psk.c</a>:
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<pre style="margin: 0;">+<span id="LC365" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">user_p</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_psk_client_credentials_t</span> <span class="n" style="color: #333;">cred</span> <span class="o" style="font-weight: 600;">=</span></span>
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<p dir="auto">That doesn't seem to be used.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286320">lib/auth/psk.h</a>:
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="c"><span class="k" style="font-weight: 600;">typedef</span> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">psk_auth_info_st</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">char</span> <span class="n" style="color: #333;">username</span><span class="p">[</span><span class="n" style="color: #333;">MAX_USERNAME_SIZE</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #099;">1</span><span class="p">];</span></span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint16_t</span> <span class="n" style="color: #333;">len</span><span class="p">;</span></span>
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<p dir="auto">Just len in this structure can be confusing (len of username, or hint?). What about username_len?</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286321">lib/psk.c</a>:
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @out: an empty gnutls datum</span></span>
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<pre style="margin: 0;">+<span id="LC482" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC483" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Return a pointer to the username of the peer in the supplied datum. Does not</span></span>
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<p dir="auto">I'd explicitly spell out <code>@out</code> here.</p>
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<p style="color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new
discussion on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/917#note_226286322">lib/psk.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="479" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
479
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<pre style="margin: 0;">+<span id="LC479" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * gnutls_psk_server_get_username2:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="480" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC480" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @session: is a gnutls session</span></span>
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<td class="diff-line-num new new_line" data-linenumber="481" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC481" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @out: an empty gnutls datum</span></span>
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<p dir="auto">What about instead: <code>a datum that will be filled in by this function</code>.</p>
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